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Democratic presidential candidate Bernie Sanders went straight to business on the "Tonight Show," calling President Franklin D. Roosevelt a model president and Republican presidential candidate Donald Trump a divisive demigogue.

Tuesday's interview opened with Sanders saying he admires Roosevelt — the two were born in New York City — as a model president to follow.

Fallon challenged Sanders to a game of “Whisper Challenge.” With headphones blasting music, they each had to take a turn to guess what the other person said by lip reading. Sanders, not missing a beat, guessed a very familiar phrase on Fallon's lips: "Feel the Bern."